Feeder Hosting Capacity and Impacts of Distribution Connected Generation. NGN Tutorial. Prepared for GOTF October 22, 2017

Transcription

1 Feeder Hosting Capacity and Impacts of Distribution Connected Generation NGN Tutorial Matthew Rylander, PhD Technical Leader Power System Studies Electric Power Research Institute Prepared for GOTF October 22, 2017

2 Outline Hosting capacity refresher What EPRI members need hosting capacity to do How EPRI solves hosting capacity What hosting capacity needs to do in the future 2

3 Again What is Hosting Capacity? Definition Hosting Capacity is the amount of DER that can be accommodated without adversely impacting power quality or reliability under current configurations and without requiring infrastructure upgrades. 3

4 Accommodate verse Integrate Accommodate DER Mitigation Active DER Positive System Impacts Passive DER No Adverse System Impacts Hosting Capacity Integrate DER 4

5 Hosting Capacity is Complex Location dependent Feeder-specific Issue dependent DER scenario dependent Time-varying And that is only based on Accommodating DER Add integration to the mix and you need to consider DER use cases Mitigation Costs Portfolios of DER 5

6 Hosting Capacity is Location Dependent Feeder 1 b (Max / Min) Substation Node 1 a Node 2 a Node 3 a Node 4 a Node 5 a Node 6 a Feeder 2 b (Max / Min) Feeder 3 b (Max / Min) a Node Hosting Capacity is dependent on DER at other nodes. That shown above is based on DER only at the specified Node. b Feeder Hosting Capacity is the Maximum/Minimum range of Node Hosting Capacity on the feeder. 6

7 Hosting Capacity is Issue Dependent Impacts Considered Voltage Primary overvoltage Primary undervoltage Primary voltage change LTC/Regulator tapping Thermal Generating power Demanding power Protection Element fault current Breaker relay reduction of reach Sympathetic breaker relay tripping Reverse power flow Unintentional islanding Protection Thermal Voltage Overall 7

8 Hosting Capacity is DER Scenario Dependent Based on specific location Substation Distributed based on unknown DER locations Substation Distributed based on current customers locations Substation 8

9 Why do EPRI Members Calculate Hosting Capacity? Enable DER planning Inform developers Assist interconnection screening Assist operational dispatch Future Functions Hosting Capacity DRIVE Planning for DER Future Functions Informing DER Developers Assisting Screening 9

10 Hosting Capacity Enables Planning with DER 10

11 Hosting Capacity Maps Inform DER Developers Hosting Capacity Maps courtesy of NYSEG/RGE 11

12 Hosting Capacity Assists in Interconnection Screening Application for Interconnection Fast Track Screening No technical analysis necessary Fail Supplemental Review Technical Analysis required Hosting Capacity Pass Pass Fail Detailed Study Interconnection Approved 12

13 Hosting Capacity Assists with Operational Dispatch The feeder hosting capacity value is dependent on the normal configuration of the feeder Hosting capacity can show if existing DER may be problematic Normal Abnormal 13

14 Utilities with Hosting Capacity Related Projects* *Only those that EPRI is working with are shown 14

15 EPRI s Hosting Capacity Method 15

16 Bridging the Gap in Distribution Planning Detailed Analysis use of power system analysis software to understand DG and solar impacts based on stochastic analysis (extensive model-based analysis) Interconnection Screens such as in FERC SGIP fasttrack screening or in CA rule 21 screening procedures (limited model-based analysis) Increasing granularity Depth Detailed Analysis DRIVE *Distribution Resource Integration and Value Estimation Interconnection Screens Breadth Increasing number of feeders Speed Detailed Analysis DRIVE* Interconnection Screens Accuracy 16

17 Overview of DRIVE A software tool that takes Input from distribution modeling programs, conducts a research - refined Analysis, and delivers Output to help distribution engineers. Input Analysis Load flow data Short-circuit impedance data Existing DER data Directly calculates DER impact Considers many DER scenarios Existing Planning Tools (CYME, Milsoft, Synergi, DEW, PowerFactory, etc.) Output Node by node DER impact System-wide results Fraction of the time for analysis EPRI DRIVE Tool 17

18 Output: Hosting Capacity Results Hosting capacity can be significantly different in the same geographic area Inform Planning/Operation Developers Interconnection Screening 18

19 What do EPRI Members need as Future Functions? New hosting capacity metrics How to integrate DER Value of DER Future Functions Future Functions Hosting Capacity DRIVE Assisting Screening Planning for DER Informing DER Developers 19

20 Secondary Node Hosting Capacity Not normally included in the utility feeder model Many unknowns but a desired metric 1 Substation Loads Service Transformer

21 DER Mitigation Analysis Existing Hosting Capacity Suite of Integration Solutions Increased Hosting Capacity After Integration Solutions Hosting Capacity higher lower Grid-Side Enhancements Hosting Capacity Violation Mitigation Solution Voltage Thermal Protection Reconductoring Voltage uprating Transformer replacement Additional voltage regulator Comm/control (curtailment) Additional relaying Hosting Capacity higher lower Operational Changes Technology Solutions Voltage regulation changes (LTC adjustment, etc.) Relay setting modification Smart Inverter (var control) Smart Inverter (watt control) Distributed var control Energy storage PV panel orientation Demand response Yes No Ma ybe 21

22 Final Thoughts All hosting capacity tools will evolve with new and improved functionality All hosting capacity tools should provide a similar result when applying the same inputs and assumptions Hosting capacity is not a static value All hosting capacity tools only estimate hosting capacity based on the models and the assumptions used in the study 22

23 Together Shaping the Future of Electricity 23